| 1 | /* File name comparison routine. |
| 2 | |
| 3 | Copyright (C) 2007 Free Software Foundation, Inc. |
| 4 | |
| 5 | This program is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation; either version 2, or (at your option) |
| 8 | any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program; if not, write to the Free Software Foundation, |
| 17 | Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ |
| 18 | |
| 19 | #ifdef HAVE_CONFIG_H |
| 20 | #include "config.h" |
| 21 | #endif |
| 22 | |
| 23 | #ifdef HAVE_STRING_H |
| 24 | #include <string.h> |
| 25 | #endif |
| 26 | |
| 27 | #include "filenames.h" |
| 28 | #include "safe-ctype.h" |
| 29 | |
| 30 | /* |
| 31 | |
| 32 | @deftypefn Extension int filename_cmp (const char *@var{s1}, const char *@var{s2}) |
| 33 | |
| 34 | Return zero if the two file names @var{s1} and @var{s2} are equivalent. |
| 35 | If not equivalent, the returned value is similar to what @code{strcmp} |
| 36 | would return. In other words, it returns a negative value if @var{s1} |
| 37 | is less than @var{s2}, or a positive value if @var{s2} is greater than |
| 38 | @var{s2}. |
| 39 | |
| 40 | This function does not normalize file names. As a result, this function |
| 41 | will treat filenames that are spelled differently as different even in |
| 42 | the case when the two filenames point to the same underlying file. |
| 43 | However, it does handle the fact that on DOS-like file systems, forward |
| 44 | and backward slashes are equal. |
| 45 | |
| 46 | @end deftypefn |
| 47 | |
| 48 | */ |
| 49 | |
| 50 | int |
| 51 | filename_cmp (const char *s1, const char *s2) |
| 52 | { |
| 53 | #if !defined(HAVE_DOS_BASED_FILE_SYSTEM) \ |
| 54 | && !defined(HAVE_CASE_INSENSITIVE_FILE_SYSTEM) |
| 55 | return strcmp(s1, s2); |
| 56 | #else |
| 57 | for (;;) |
| 58 | { |
| 59 | int c1 = *s1; |
| 60 | int c2 = *s2; |
| 61 | |
| 62 | #if defined (HAVE_CASE_INSENSITIVE_FILE_SYSTEM) |
| 63 | c1 = TOLOWER (c1); |
| 64 | c2 = TOLOWER (c2); |
| 65 | #endif |
| 66 | |
| 67 | #if defined (HAVE_DOS_BASED_FILE_SYSTEM) |
| 68 | /* On DOS-based file systems, the '/' and the '\' are equivalent. */ |
| 69 | if (c1 == '/') |
| 70 | c1 = '\\'; |
| 71 | if (c2 == '/') |
| 72 | c2 = '\\'; |
| 73 | #endif |
| 74 | |
| 75 | if (c1 != c2) |
| 76 | return (c1 - c2); |
| 77 | |
| 78 | if (c1 == '\0') |
| 79 | return 0; |
| 80 | |
| 81 | s1++; |
| 82 | s2++; |
| 83 | } |
| 84 | #endif |
| 85 | } |
| 86 | |
| 87 | /* |
| 88 | |
| 89 | @deftypefn Extension int filename_ncmp (const char *@var{s1}, const char *@var{s2}, size_t @var{n}) |
| 90 | |
| 91 | Return zero if the two file names @var{s1} and @var{s2} are equivalent |
| 92 | in range @var{n}. |
| 93 | If not equivalent, the returned value is similar to what @code{strncmp} |
| 94 | would return. In other words, it returns a negative value if @var{s1} |
| 95 | is less than @var{s2}, or a positive value if @var{s2} is greater than |
| 96 | @var{s2}. |
| 97 | |
| 98 | This function does not normalize file names. As a result, this function |
| 99 | will treat filenames that are spelled differently as different even in |
| 100 | the case when the two filenames point to the same underlying file. |
| 101 | However, it does handle the fact that on DOS-like file systems, forward |
| 102 | and backward slashes are equal. |
| 103 | |
| 104 | @end deftypefn |
| 105 | |
| 106 | */ |
| 107 | |
| 108 | int |
| 109 | filename_ncmp (const char *s1, const char *s2, size_t n) |
| 110 | { |
| 111 | #if !defined(HAVE_DOS_BASED_FILE_SYSTEM) \ |
| 112 | && !defined(HAVE_CASE_INSENSITIVE_FILE_SYSTEM) |
| 113 | return strncmp(s1, s2, n); |
| 114 | #else |
| 115 | if (!n) |
| 116 | return 0; |
| 117 | for (; n > 0; --n) |
| 118 | { |
| 119 | int c1 = *s1; |
| 120 | int c2 = *s2; |
| 121 | |
| 122 | #if defined (HAVE_CASE_INSENSITIVE_FILE_SYSTEM) |
| 123 | c1 = TOLOWER (c1); |
| 124 | c2 = TOLOWER (c2); |
| 125 | #endif |
| 126 | |
| 127 | #if defined (HAVE_DOS_BASED_FILE_SYSTEM) |
| 128 | /* On DOS-based file systems, the '/' and the '\' are equivalent. */ |
| 129 | if (c1 == '/') |
| 130 | c1 = '\\'; |
| 131 | if (c2 == '/') |
| 132 | c2 = '\\'; |
| 133 | #endif |
| 134 | |
| 135 | if (c1 == '\0' || c1 != c2) |
| 136 | return (c1 - c2); |
| 137 | |
| 138 | s1++; |
| 139 | s2++; |
| 140 | } |
| 141 | return 0; |
| 142 | #endif |
| 143 | } |
| 144 | |
| 145 | /* |
| 146 | |
| 147 | @deftypefn Extension hashval_t filename_hash (const void *@var{s}) |
| 148 | |
| 149 | Return the hash value for file name @var{s} that will be compared |
| 150 | using filename_cmp. |
| 151 | This function is for use with hashtab.c hash tables. |
| 152 | |
| 153 | @end deftypefn |
| 154 | |
| 155 | */ |
| 156 | |
| 157 | hashval_t |
| 158 | filename_hash (const void *s) |
| 159 | { |
| 160 | /* The cast is for -Wc++-compat. */ |
| 161 | const unsigned char *str = (const unsigned char *) s; |
| 162 | hashval_t r = 0; |
| 163 | unsigned char c; |
| 164 | |
| 165 | while ((c = *str++) != 0) |
| 166 | { |
| 167 | if (c == '\\') |
| 168 | c = '/'; |
| 169 | c = TOLOWER (c); |
| 170 | r = r * 67 + c - 113; |
| 171 | } |
| 172 | |
| 173 | return r; |
| 174 | } |
| 175 | |
| 176 | /* |
| 177 | |
| 178 | @deftypefn Extension int filename_eq (const void *@var{s1}, const void *@var{s2}) |
| 179 | |
| 180 | Return non-zero if file names @var{s1} and @var{s2} are equivalent. |
| 181 | This function is for use with hashtab.c hash tables. |
| 182 | |
| 183 | @end deftypefn |
| 184 | |
| 185 | */ |
| 186 | |
| 187 | int |
| 188 | filename_eq (const void *s1, const void *s2) |
| 189 | { |
| 190 | /* The casts are for -Wc++-compat. */ |
| 191 | return filename_cmp ((const char *) s1, (const char *) s2) == 0; |
| 192 | } |